Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing

Abstract

As a candidate scheme for controllably coupled qubits, we consider two quantum dots, each doped with a single electron. The spin of the electron defines our qubit basis and trion states can be created by using polarized light; we show that the form of the excited trion depends on the state of the qubit. By using the Luttinger-Kohn Hamiltonian we calculate the form of these trion states in the presence of light-heavy hole mixing, and show that they can interact through both the Förster transfer and static dipole-dipole interactions. Finally, we demonstrate that by using chirped laser pulses, it is possible to perform a two-qubit gate in this system by adiabatically following the eigenstates as a function of laser detuning. These gates are robust in that they operate with any realistic degree of hole mixing, and for either type of trion-trion coupling.

Updated with published version, references updated

References in corpus (29)

• Quantum Computation with Quantum Dots
• Efficient high-fidelity quantum computation using matter qubits and linear optics
• Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot
• Phonon-induced decay of the electron spin in quantum dots
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Hilbert space structure of a solid state quantum computer: two-electron states of a double quantum dot artificial molecule
• Theoretical interpretation of the experimental electronic structure of lens shaped, self-assembled InAs/GaAs quantum dots
• Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
• Stimulated and spontaneous optical generation of electron spin coherence in charged GaAs quantum dots
• Repeat-Until-Success Quantum Computing
• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Optical Schemes for Quantum Computation in Quantum Dot Molecules
• Optical RKKY Interaction between Charged Semiconductor Quantum Dots
• Photon Correlation Spectroscopy of a Single Quantum Dot
• Electro-optical properties of semiconductor quantum dots: Application to quantum information processing
• Optical excitations of a self assembled artificial ion
• Optical spectroscopy of single quantum dots at tunable positive, neutral and negative charge states
• Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot
• Spin-based optical quantum gates via Pauli blocking in semiconductor quantum dots
• High-finesse optical quantum gates for electron spins in artificial molecules
• Anticrossings in Foerster Coupled Quantum Dots
• Schemes for Parallel Quantum Computation Without Local Control of Qubits
• Spin-based quantum computation in multielectron quantum dots
• Spin-Forster transfer in optically excited quantum dots
• Selective spin coupling through a single exciton
• Polarization-dependent shift in excitonic Zeeman splitting of self-assembled InAlAs quantum dots
• Optical Detection of Single-Electron Spin Decoherence in a Quantum Dot
• Calculation of pure dephasing for excitons in quantum dots
• Spin state readout by quantum jump technique: for the purpose of quantum computing

Cited by in corpus (17)

• Ultrafast optical control of entanglement between two quantum dot spins
• Quantum computing by optical control of electron spins
• Prospects for measurement-based quantum computing with solid state spins
• Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration
• Hybrid solid state qubits: the powerful role of electron spins
• Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots
• High fidelity all-optical control of quantum dot spins: detailed study of the adiabatic approach
• Robust adiabatic approach to optical spin entangling in coupled quantum dots
• Interplay and optimization of decoherence mechanisms in the optical control of spin quantum bits implemented on a semiconductor quantum dot
• Optically induced spin gates in coupled quantum dots using the electron-hole exchange interaction
• Charge-to-spin conversion of electron entanglement states and spin-interaction-free solid-state quantum computation
• Adiabatic optical entanglement between electron spins in separate quantum dots
• Global Optical Control of a Quantum Spin Chain
• Entanglement of Remote Spins with Unequal Coupling to an Optically Active Mediator
• Measurement-based approach to entanglement generation in coupled quantum dots
• Noise effects and tomography of remote entangled spins in quantum dots
• Fidelity of Optically Controlled Single- and Two-Qubit Operations on Coulomb-Coupled Quantum Dots